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Four methods of mobile IP (MIP) registration, call admission control (CAC), L2/L3 mobility and DiffServ mapping are mentioned for QoS assurance in portable Internet networks. At first implementation stage of portable Internet operators, affording of best effort services are recommended by applying the QoS assurance methods of CAC of maximum bandwidth, L2 mobility and DiffServ mapping for request services...
In this paper, we propose a QoS-enabled VPN architecture supporting a new service level agreement (SLA), called mu SLA to allow customer to specify QoS requirement. Such a QoS requirement is in terms of VPN total bandwidth and real-time micro-flow bandwidth. The proposed architecture is based on VPN hose model over DiffServ network and on logical bandwidth partitions at edge routers into various classes...
We propose a scheme for hierarchical overlay multicast based on IP topology awareness and host group model called PAM (practical topology-aware overlay multicast). PAM is remarkably different from the previous overlay multicast or ALM (application layer multicast) schemes in the following aspects. First, instead of end-host, DR (designated router) builds overlay DDT (data delivery tree) by adopting...
In this paper, we investigate the effect of different restoration sequence upon multiple failure recovery in multi-wavelength WDM networks. The major difference among these arrangements is on restoration speed and resource utilization. We develop heuristics to find restoration sequence for dynamic traffic demands with different quality of service requirements. Especially, we adopt the aggregate rerouting...
Firewall is a fundamental network security technology that protects inner network from unsafe or malicious network traffic outside. The design suggested in the paper is to put this firewall function into a router to support not only packet routing but also network security. The architecture of those integrated function is based on Intel network processor IXP2400 platform to maximize the performance
This paper presents a novel technique for providing non-stop IP-based television broadcasting service on ISP's multicast network. Although ISP network is highly available in terms of both data link and network layers, the recovery time from some network layer trouble may be intolerable to provide broadcasting service. We propose a gateway approach for providing loss-less backup multicast distribution...
This paper proposes extended peer-to-peer (P2P) protocol based on IPv6. There are a lot of works on structured P2P protocols using distributed hash table (DHT). Especially, our P2P algorithm and implementation are focused on the efficiency and the scalability for maintaining the P2P overlay network. To achieve efficient routing, we merge the P2P overlay with the messenger service. With friend nodes...
Majority of the IPv6 prefixes are 48 to 64 bits long. Conventional approach that configures the TCAM array to use 144-bit words to store IPv6 prefixes has a rather low space efficiency. Because of the limited number of I/O pins, an 128-bit IPv6 address has to be entered to the TCAM in 2 steps. If the longest matching prefix is only up to 64 bits, it may not be necessary to process the second half...
IP multicast shows a very strong advantage in the group communication services. To deploy IP multicast in the current Internet, every IP router must be changed into multicast enabled ones and several deployment issues should be solved. These problems prevent IP multicast mechanism from being deployed in the IP world. These problems gives a good reason why today's group communication uses replicated...
This paper discusses the NP-complete multi-constrained path problem with imprecise state information, and a distributed heuristic framework without any imprecision assumption is presented. This framework needs no link state exchanging message, and employs mobile agents to search feasible paths in parallel. Two key strategies are used: to select a suitable next node, and to choose the appropriate one...
IP multicast shows very strong advantage in the group communication services. But to deploy IP multicast in the current Internet, every IP routers must be changed into multicast enabled ones and several deployment issues should be solved. So theses problems prevent IP multicast mechanism from being deployed in IP world. And these problems give a good reason why today's group communication uses replicated...
This paper is about multiprocessor interconnects for a high capacity router. In the multiprocessor communication, most transfers are from one port to the other ports or the opposite direction (usually between a main processor and local processors on line cards). Congestion may happen when interprocessor communication packets from local processors are simultaneously heading for a main processor. In...
The capability of multiprotocol label switching (MPLS) of explicit routing as well as of transferring the traffic flows on several, possible equal cost, paths allows load balancing scheme. Exploiting this capability of MPLS, a revenue aware load balancing mechanism is proposed in this paper. The main goal of this proposal is to maximize total network revenue so that quality of service (QoS) requirements...
This paper analyses the reason for congestion in BACnet network and conventional congestion avoidance algorithm. On the base of conventional RED algorithm, an absolute priority based congestion avoidance algorithm named enhanced random early detection (ERED) algorithm is presented. Similar to the conventional RED algorithm, ERED detects congestion according to the average queue length. ERED differs...
Packet switched network-on-chip (NoC) has been proposed to support the trend for system-on-chip integration. In this paper, adaptive routing scheme for small buffer size to guarantee low drop rate is proposed. We model NtimesN mesh topology using C++, and then simulate and evaluate the NoC communication architecture
As quality-guaranteed services, such as voice and streaming services, are required over Internet, traffic engineering based on an MPLS technology is being introduced. In MPLS traffic engineering, information related with service's quality requirements is forwarded through routers on a quality-guaranteed path by an MPLS signaling protocol. Routers on the quality-guaranteed path forward traffic for...
Streaming services over the Internet are expected to grow rapidly in the near future. However, packet losses caused by buffer overflow at routers are a serious problem in these services, and are responsible for degradation of the quality of service (QoS). Forward error correction (FEC) is a promising technique to recover the lost packets and improve the QoS of streaming media. However, if FEC is applied...
Designing the topology of communication network is a complex multiple constraints and multiple criterions optimization problem. This paper presents a tabu search algorithm (TSA) to setting up a network while simultaneously minimizing network installation cost subject to reliability and maximizing reliability of network subject to a budget. Results for three test networks, show that the proposed algorithm...
This paper shows simulation results with exponential traffic in OBS network. We first describe our scheme. Simulation is done with OPNET tool. From the simulation, we find proper guard-band and FDL length for OBS node. Using this result, we show blocking rate to verify our simulation result
Multiprotocol label switching (MPLS) has been deployed by some major carriers in recent years, as the Internet has matured to be the most dominant network and many current Internet applications require better quality of service (QoS), such as better reliability, delay, jitter, and bandwidth. The main task for solving QoS problems in the Internet protocol (IP) is to control congestion and bursts of...
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